<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .title {
            color: pink;
            /* text-align: center; */
            /* line-height: 100vh; */
            border: 1px solid pink;
            border-radius: 5px;
            transition: all 1s ease-in-out;
        }

        .title:hover {
            transform: rotateZ(360deg);
        }

        .flex {
            display: flex;
            width: 100%;
            height: 100vh;
            align-items: center;
            justify-content: center;
        }
    </style>
</head>

<body>
    <div class="flex">
        <h1 class="title">Hello</h1>

    </div>
    <button>按钮</button>
    <script src="./1.js"></script>
    <script src="./2.js"></script>


</body>

</html>